In ancient times, socrates  in greece were considered in high esteem for their knowledge. One day a follower of great philosopher went to him and started saying, "Do you know what things I just heard about one of your friend?"Just before he could say anything further philosopher interrupted him saying, "Hold on a minute. before you tell me about my friends it would be good to just wait for moment and filter what you are going to say. I call it a triple filter test"Philosopher continued, "First filter is truth.. have you made sure that what ever you are going to tell me, is true?" "Well no, actually I just heard about it.." Replied man. "Ok. so you are not sure if it's true or not." Said philosopher. He continued, "Now, lets try second filter. it's filter of goodness. thing you are going to tell me about my friend, is it something good?" "No, on contrary.." Replied man. Now philosopher said, "So, the thing you are going to tell me about my friend is bad and you are not sure if it's true.."He continued and said, "You may still pass test. because there is one filter left. last filter is filter of usefulness. is what ever you are going to tell me about my friends, is it going to be of any use to me?" "No not really.." Replied man"Well" Concluded philosopher and questioned to man, "If what you want to tell is neither true, nor good and not even useful, then you want to tell me about it at all??" 
If we get to know something we should check if it's true. When it's about friendship or relationship all bonds are built on trust. We should just trust any rumor about people close to us. The happiness of your life depends on quality of your thoughts. 